sectional density's effect on bullet performance

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by sscoyote, Aug 2, 2003.

  1. sscoyote

    sscoyote Well-Known Member

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    sectional density\'s effect on bullet performance

    I know that it is interrelated with B.C., but I'm not sure what the difference is, and it's application to LR??
     
  2. Dave King

    Dave King Well-Known Member

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  3. MAX

    MAX Well-Known Member

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    Re: sectional density\'s effect on bullet performance

    sscoyote, SD or sectional density is a measure of mass to cross section of a projectile. For a given caliber, higher SD means greater penetration IF ALL OTHER THINGS ARE EQUAL.

    SD is used to calculate ballistic coefficient(BC). BC is a measure of how well a projectile retains velocity in comparison to a standard projectile. Any number less than 1 means it retains less velocity at a given range, 1 is equal, and more than 1 denotes more retained velocity. Another way of looking at it is that it reflects a bullet's drag characteristics.

    In calculating BC, the bullet's FORM is considered in relation to SD, which presents a NON-DIMENSIONAL value for comparison. BC for a given form is directly proportional to SD.

    Try "Understanding Firearm Ballistics" by Robert Rinker. It is a cheap and time saving education, which cover interior/exterior and terminal ballistics. Luck.
     
  4. sscoyote

    sscoyote Well-Known Member

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    Re: sectional density\'s effect on bullet performance

    Thks. guys